Allen-Bradley 1756-CNB/E, User Manual

Page: 139 / 186

Publication 1756-UM523F-EN-P - December 2006
Update Modules and Redundant Systems 139
Redundant System Relationships
Different terms are unique to normal redundancy and redundancy
during an update.
Complete this procedure to update the firmware of a redundant
chassis without shutting down the process.
IMPORTANT
When a secondary communications module is locking for
updating, it displays SLU. When a primary communications
module is locked for updating and has firmware revision 15.56
or later, it displays PLU. If the primary communications module’s
firmware is an earlier revision, PwQS will be displayed when
the system is locked.
This term in normal redundancy Equates to this term during the updating of a
redundant system
Synchronize Lock for Update
Synchronizing Locking for Update
Synchronized Locked for Update
Switchover Locked Switchover
IMPORTANT
Use this procedure only if your system is already at revision 13.
Do not use this procedure if:
•
your system is at revision 11 or earlier.
•
your system is not operating yet.
During this procedure, you will not be able to use RSLogix 5000 software
to change the mode of the controller. Use the keyswitch on the front of
the controller to change its mode.
Leave RSNetWorx for ControlNet software closed or offline throughout
this procedure. Otherwise, you will see errors in the RSNetWorx
software during the update process.
During this procedure:
•
do not make any changes to the RSLogix 5000 project other than
the ones called out in this procedure.
•
make sure no one else makes changes to the project.